GitLab

* [ci] move R-package artifact publishing to GitHub Actions

* create artifacts directory

* ensure both files are included

* restore other CI

* create artifacts directory unconditionally

* Update .github/workflows/r_package.yml
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

---------
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>